5" gauge Britannia (a builder's diary)

[springcrocus]

David, PM sent.

Regards, Steve

[shmbry]

Aug 3, 2020 18:30:11 GMT springcrocus said:

Finding another excuse for not sorting the top profile of the boiler, I made up a nice little valve for the blower. This is a kit of four body castings plus other materials to complete the valves. I made one change because they supplied brass rod to make the valve stem and I substituted stainless steel. I found it easier to machine the whole of the spindle complete before parting off.



The rest of the parts were straightforward turning although depths had to be controlled quite precisely. The wall thickness between the valve bed and the inlet port is only thirty thou or so. I have substituted ME threads for the American National Fine threads specified on the drawing and I also made a square end on the spindle for a positive drive for the handwheel.



Steam is taken from the manifold and passed through the dummy duplex valve before passing through my valve and on through the hollow blower stay. Here it is mounted on the cleading.



When Wilf and I were building the boiler, Adam chewed my ear about how unsightly and un-prototypical the pipework to the blower stay looked, spoiling the clean lines of the backhead. The suggestion was to run the pipe outside, as in fullsize. This is my compromise that uses the hollow stay but, effectively, hides the pipework from sight below the regulator with it passing behind the false backhead.



I think it's a reasonable compromise.

Steve

Hi Steve. Where di you get the valve kit from ?

[mbrown]

Hi shmbry,

I am not sure if Steve is active on this forum any more (more's the pity - if you're out there Steve, I wish we could tempt you back....)

But the kits are available from Macc Models:

maccmodels.co.uk/shop/globe-valve-kit-1-4-x-40-2/

Best wishes

Malcolm

[shmbry]

May 29, 2023 13:23:00 GMT mbrown said:

Hi shmbry,

I am not sure if Steve is active on this forum any more (more's the pity - if you're out there Steve, I wish we could tempt you back....)

But the kits are available from Macc Models:

maccmodels.co.uk/shop/globe-valve-kit-1-4-x-40-2/

Best wishes

Malcolm

Many thanks Malcolm. I don't suppose you have the drawing ? I would would like to add it to my CAD model.

[mbrown]

Check with Mac Models. You may find the drawing comes with the kit of parts.

Malcolm

[millman]

Drawing is included in kit of parts, think they do two sizes of valve I cannot remember, I purchased mine a while ago and have not got round to machining them yet, like a lot of other things, too much to do and not enough time to do it!